diff --git a/zip/cmd/main.go b/zip/cmd/main.go
index dfd56dc..f49105a 100644
--- a/zip/cmd/main.go
+++ b/zip/cmd/main.go
@@ -199,6 +199,11 @@
 
 	flags.Parse(expandedArgs[1:])
 
+	if flags.NArg() > 0 {
+		fmt.Fprintf(os.Stderr, "unexpected arguments %s\n", strings.Join(flags.Args(), " "))
+		usage()
+	}
+
 	err := zip.Run(zip.ZipArgs{
 		FileArgs:                 fArgs,
 		OutputFilePath:           *out,